The Vintage Wrist Watch Company has dated this piece to the 1910s.
The movement is signed American Waltham U.S.A. Traveler. And the serial number 21116925 which dates the watch to 1917.

The watch measures 50.3 mm diameter excluding the lugs. The gold filled case is stamped Moon trade mark, A.L.D. Dennison Watch Case Co. English make Guaranteed to be made of two plates of 10 ct gold with plate of composition between and to wear 20 years. The case has light surface marks from use and the odd tiny "ding" but overall it is in nice condition for a 1917 piece.
The watch lens is plastic and is in nice condition.
The dial is signed Waltham and is in nice condition.
The watch has its original blued steel hands.
Price includes worldwide postage.
The Vintage Wrist Watch Company has dated this piece to the 1910s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page